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I wanted to make a file read-only (440)in internal storage but it shows "failed",as it seemingly requires root permission but I can't unlock bootloader as of now so is there any means we can do the above task?

S.D
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    Not the exact solution but with root access you can set immutable flag (chattr +i) on file on underlying real filesystem (in /data/media/). – Irfan Latif May 05 '20 at 15:51
  • How to get root access, is it possible with unrooted phone? – S.D May 06 '20 at 05:13

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